sound/core/pcm_lib.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   4  *                   Abramo Bagnara <abramo@alsa-project.org>
   5  *
   6  *
   7  *   This program is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU General Public License as published by
   9  *   the Free Software Foundation; either version 2 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This program is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with this program; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  20  *
  21  */
  22
  23 #include <sound/driver.h>
  24 #include <linux/slab.h>
  25 #include <linux/time.h>
  26 #include <sound/core.h>
  27 #include <sound/control.h>
  28 #include <sound/info.h>
  29 #include <sound/pcm.h>
  30 #include <sound/pcm_params.h>
  31 #include <sound/timer.h>
  32
  33 /*
  34  * fill ring buffer with silence
  35  * runtime->silence_start: starting pointer to silence area
  36  * runtime->silence_filled: size filled with silence
  37  * runtime->silence_threshold: threshold from application
  38  * runtime->silence_size: maximal size from application
  39  *
  40  * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
  41  */
  42 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
  43 {
  44         struct snd_pcm_runtime *runtime = substream->runtime;
  45         snd_pcm_uframes_t frames, ofs, transfer;
  46
  47         if (runtime->silence_size < runtime->boundary) {
  48                 snd_pcm_sframes_t noise_dist, n;
  49                 if (runtime->silence_start != runtime->control->appl_ptr) {
  50                         n = runtime->control->appl_ptr - runtime->silence_start;
  51                         if (n < 0)
  52                                 n += runtime->boundary;
  53                         if ((snd_pcm_uframes_t)n < runtime->silence_filled)
  54                                 runtime->silence_filled -= n;
  55                         else
  56                                 runtime->silence_filled = 0;
  57                         runtime->silence_start = runtime->control->appl_ptr;
  58                 }
  59                 if (runtime->silence_filled == runtime->buffer_size)
  60                         return;
  61                 snd_assert(runtime->silence_filled <= runtime->buffer_size, return);
  62                 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
  63                 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
  64                         return;
  65                 frames = runtime->silence_threshold - noise_dist;
  66                 if (frames > runtime->silence_size)
  67                         frames = runtime->silence_size;
  68         } else {
  69                 if (new_hw_ptr == ULONG_MAX) {  /* initialization */
  70                         snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
  71                         runtime->silence_filled = avail > 0 ? avail : 0;
  72                         runtime->silence_start = (runtime->status->hw_ptr +
  73                                                   runtime->silence_filled) %
  74                                                  runtime->boundary;
  75                 } else {
  76                         ofs = runtime->status->hw_ptr;
  77                         frames = new_hw_ptr - ofs;
  78                         if ((snd_pcm_sframes_t)frames < 0)
  79                                 frames += runtime->boundary;
  80                         runtime->silence_filled -= frames;
  81                         if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
  82                                 runtime->silence_filled = 0;
  83                                 runtime->silence_start = (ofs + frames) - runtime->buffer_size;
  84                         } else {
  85                                 runtime->silence_start = ofs - runtime->silence_filled;
  86                         }
  87                         if ((snd_pcm_sframes_t)runtime->silence_start < 0)
  88                                 runtime->silence_start += runtime->boundary;
  89                 }
  90                 frames = runtime->buffer_size - runtime->silence_filled;
  91         }
  92         snd_assert(frames <= runtime->buffer_size, return);
  93         if (frames == 0)
  94                 return;
  95         ofs = (runtime->silence_start + runtime->silence_filled) % runtime->buffer_size;
  96         while (frames > 0) {
  97                 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
  98                 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
  99                     runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
 100                         if (substream->ops->silence) {
 101                                 int err;
 102                                 err = substream->ops->silence(substream, -1, ofs, transfer);
 103                                 snd_assert(err >= 0, );
 104                         } else {
 105                                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
 106                                 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
 107                         }
 108                 } else {
 109                         unsigned int c;
 110                         unsigned int channels = runtime->channels;
 111                         if (substream->ops->silence) {
 112                                 for (c = 0; c < channels; ++c) {
 113                                         int err;
 114                                         err = substream->ops->silence(substream, c, ofs, transfer);
 115                                         snd_assert(err >= 0, );
 116                                 }
 117                         } else {
 118                                 size_t dma_csize = runtime->dma_bytes / channels;
 119                                 for (c = 0; c < channels; ++c) {
 120                                         char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
 121                                         snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
 122                                 }
 123                         }
 124                 }
 125                 runtime->silence_filled += transfer;
 126                 frames -= transfer;
 127                 ofs = 0;
 128         }
 129 }
 130
 131 static void xrun(struct snd_pcm_substream *substream)
 132 {
 133         snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 134 #ifdef CONFIG_SND_DEBUG
 135         if (substream->pstr->xrun_debug) {
 136                 snd_printd(KERN_DEBUG "XRUN: pcmC%dD%d%c\n",
 137                            substream->pcm->card->number,
 138                            substream->pcm->device,
 139                            substream->stream ? 'c' : 'p');
 140                 if (substream->pstr->xrun_debug > 1)
 141                         dump_stack();
 142         }
 143 #endif
 144 }
 145
 146 static inline snd_pcm_uframes_t snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream *substream,
 147                                                           struct snd_pcm_runtime *runtime)
 148 {
 149         snd_pcm_uframes_t pos;
 150
 151         pos = substream->ops->pointer(substream);
 152         if (pos == SNDRV_PCM_POS_XRUN)
 153                 return pos; /* XRUN */
 154         if (runtime->tstamp_mode & SNDRV_PCM_TSTAMP_MMAP)
 155                 getnstimeofday((struct timespec *)&runtime->status->tstamp);
 156 #ifdef CONFIG_SND_DEBUG
 157         if (pos >= runtime->buffer_size) {
 158                 snd_printk(KERN_ERR  "BUG: stream = %i, pos = 0x%lx, buffer size = 0x%lx, period size = 0x%lx\n", substream->stream, pos, runtime->buffer_size, runtime->period_size);
 159         }
 160 #endif
 161         pos -= pos % runtime->min_align;
 162         return pos;
 163 }
 164
 165 static inline int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream *substream,
 166                                              struct snd_pcm_runtime *runtime)
 167 {
 168         snd_pcm_uframes_t avail;
 169
 170         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 171                 avail = snd_pcm_playback_avail(runtime);
 172         else
 173                 avail = snd_pcm_capture_avail(runtime);
 174         if (avail > runtime->avail_max)
 175                 runtime->avail_max = avail;
 176         if (avail >= runtime->stop_threshold) {
 177                 if (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING)
 178                         snd_pcm_drain_done(substream);
 179                 else
 180                         xrun(substream);
 181                 return -EPIPE;
 182         }
 183         if (avail >= runtime->control->avail_min)
 184                 wake_up(&runtime->sleep);
 185         return 0;
 186 }
 187
 188 static inline int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
 189 {
 190         struct snd_pcm_runtime *runtime = substream->runtime;
 191         snd_pcm_uframes_t pos;
 192         snd_pcm_uframes_t new_hw_ptr, hw_ptr_interrupt;
 193         snd_pcm_sframes_t delta;
 194
 195         pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
 196         if (pos == SNDRV_PCM_POS_XRUN) {
 197                 xrun(substream);
 198                 return -EPIPE;
 199         }
 200         if (runtime->period_size == runtime->buffer_size)
 201                 goto __next_buf;
 202         new_hw_ptr = runtime->hw_ptr_base + pos;
 203         hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size;
 204
 205         delta = hw_ptr_interrupt - new_hw_ptr;
 206         if (delta > 0) {
 207                 if ((snd_pcm_uframes_t)delta < runtime->buffer_size / 2) {
 208 #ifdef CONFIG_SND_DEBUG
 209                         if (runtime->periods > 1 && substream->pstr->xrun_debug) {
 210                                 snd_printd(KERN_ERR "Unexpected hw_pointer value [1] (stream = %i, delta: -%ld, max jitter = %ld): wrong interrupt acknowledge?\n", substream->stream, (long) delta, runtime->buffer_size / 2);
 211                                 if (substream->pstr->xrun_debug > 1)
 212                                         dump_stack();
 213                         }
 214 #endif
 215                         return 0;
 216                 }
 217               __next_buf:
 218                 runtime->hw_ptr_base += runtime->buffer_size;
 219                 if (runtime->hw_ptr_base == runtime->boundary)
 220                         runtime->hw_ptr_base = 0;
 221                 new_hw_ptr = runtime->hw_ptr_base + pos;
 222         }
 223
 224         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 225             runtime->silence_size > 0)
 226                 snd_pcm_playback_silence(substream, new_hw_ptr);
 227
 228         runtime->status->hw_ptr = new_hw_ptr;
 229         runtime->hw_ptr_interrupt = new_hw_ptr - new_hw_ptr % runtime->period_size;
 230
 231         return snd_pcm_update_hw_ptr_post(substream, runtime);
 232 }
 233
 234 /* CAUTION: call it with irq disabled */
 235 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
 236 {
 237         struct snd_pcm_runtime *runtime = substream->runtime;
 238         snd_pcm_uframes_t pos;
 239         snd_pcm_uframes_t old_hw_ptr, new_hw_ptr;
 240         snd_pcm_sframes_t delta;
 241
 242         old_hw_ptr = runtime->status->hw_ptr;
 243         pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
 244         if (pos == SNDRV_PCM_POS_XRUN) {
 245                 xrun(substream);
 246                 return -EPIPE;
 247         }
 248         new_hw_ptr = runtime->hw_ptr_base + pos;
 249
 250         delta = old_hw_ptr - new_hw_ptr;
 251         if (delta > 0) {
 252                 if ((snd_pcm_uframes_t)delta < runtime->buffer_size / 2) {
 253 #ifdef CONFIG_SND_DEBUG
 254                         if (runtime->periods > 2 && substream->pstr->xrun_debug) {
 255                                 snd_printd(KERN_ERR "Unexpected hw_pointer value [2] (stream = %i, delta: -%ld, max jitter = %ld): wrong interrupt acknowledge?\n", substream->stream, (long) delta, runtime->buffer_size / 2);
 256                                 if (substream->pstr->xrun_debug > 1)
 257                                         dump_stack();
 258                         }
 259 #endif
 260                         return 0;
 261                 }
 262                 runtime->hw_ptr_base += runtime->buffer_size;
 263                 if (runtime->hw_ptr_base == runtime->boundary)
 264                         runtime->hw_ptr_base = 0;
 265                 new_hw_ptr = runtime->hw_ptr_base + pos;
 266         }
 267         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 268             runtime->silence_size > 0)
 269                 snd_pcm_playback_silence(substream, new_hw_ptr);
 270
 271         runtime->status->hw_ptr = new_hw_ptr;
 272
 273         return snd_pcm_update_hw_ptr_post(substream, runtime);
 274 }
 275
 276 /**
 277  * snd_pcm_set_ops - set the PCM operators
 278  * @pcm: the pcm instance
 279  * @direction: stream direction, SNDRV_PCM_STREAM_XXX
 280  * @ops: the operator table
 281  *
 282  * Sets the given PCM operators to the pcm instance.
 283  */
 284 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
 285 {
 286         struct snd_pcm_str *stream = &pcm->streams[direction];
 287         struct snd_pcm_substream *substream;
 288
 289         for (substream = stream->substream; substream != NULL; substream = substream->next)
 290                 substream->ops = ops;
 291 }
 292
 293
 294 /**
 295  * snd_pcm_sync - set the PCM sync id
 296  * @substream: the pcm substream
 297  *
 298  * Sets the PCM sync identifier for the card.
 299  */
 300 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
 301 {
 302         struct snd_pcm_runtime *runtime = substream->runtime;
 303
 304         runtime->sync.id32[0] = substream->pcm->card->number;
 305         runtime->sync.id32[1] = -1;
 306         runtime->sync.id32[2] = -1;
 307         runtime->sync.id32[3] = -1;
 308 }
 309
 310 /*
 311  *  Standard ioctl routine
 312  */
 313
 314 /* Code taken from alsa-lib */
 315 #define assert(a) snd_assert((a), return -EINVAL)
 316
 317 static inline unsigned int div32(unsigned int a, unsigned int b,
 318                                  unsigned int *r)
 319 {
 320         if (b == 0) {
 321                 *r = 0;
 322                 return UINT_MAX;
 323         }
 324         *r = a % b;
 325         return a / b;
 326 }
 327
 328 static inline unsigned int div_down(unsigned int a, unsigned int b)
 329 {
 330         if (b == 0)
 331                 return UINT_MAX;
 332         return a / b;
 333 }
 334
 335 static inline unsigned int div_up(unsigned int a, unsigned int b)
 336 {
 337         unsigned int r;
 338         unsigned int q;
 339         if (b == 0)
 340                 return UINT_MAX;
 341         q = div32(a, b, &r);
 342         if (r)
 343                 ++q;
 344         return q;
 345 }
 346
 347 static inline unsigned int mul(unsigned int a, unsigned int b)
 348 {
 349         if (a == 0)
 350                 return 0;
 351         if (div_down(UINT_MAX, a) < b)
 352                 return UINT_MAX;
 353         return a * b;
 354 }
 355
 356 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
 357                                     unsigned int c, unsigned int *r)
 358 {
 359         u_int64_t n = (u_int64_t) a * b;
 360         if (c == 0) {
 361                 snd_assert(n > 0, );
 362                 *r = 0;
 363                 return UINT_MAX;
 364         }
 365         div64_32(&n, c, r);
 366         if (n >= UINT_MAX) {
 367                 *r = 0;
 368                 return UINT_MAX;
 369         }
 370         return n;
 371 }
 372
 373 static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
 374 {
 375         int changed = 0;
 376         assert(!snd_interval_empty(i));
 377         if (i->min < min) {
 378                 i->min = min;
 379                 i->openmin = openmin;
 380                 changed = 1;
 381         } else if (i->min == min && !i->openmin && openmin) {
 382                 i->openmin = 1;
 383                 changed = 1;
 384         }
 385         if (i->integer) {
 386                 if (i->openmin) {
 387                         i->min++;
 388                         i->openmin = 0;
 389                 }
 390         }
 391         if (snd_interval_checkempty(i)) {
 392                 snd_interval_none(i);
 393                 return -EINVAL;
 394         }
 395         return changed;
 396 }
 397
 398 static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
 399 {
 400         int changed = 0;
 401         assert(!snd_interval_empty(i));
 402         if (i->max > max) {
 403                 i->max = max;
 404                 i->openmax = openmax;
 405                 changed = 1;
 406         } else if (i->max == max && !i->openmax && openmax) {
 407                 i->openmax = 1;
 408                 changed = 1;
 409         }
 410         if (i->integer) {
 411                 if (i->openmax) {
 412                         i->max--;
 413                         i->openmax = 0;
 414                 }
 415         }
 416         if (snd_interval_checkempty(i)) {
 417                 snd_interval_none(i);
 418                 return -EINVAL;
 419         }
 420         return changed;
 421 }
 422
 423 /**
 424  * snd_interval_refine - refine the interval value of configurator
 425  * @i: the interval value to refine
 426  * @v: the interval value to refer to
 427  *
 428  * Refines the interval value with the reference value.
 429  * The interval is changed to the range satisfying both intervals.
 430  * The interval status (min, max, integer, etc.) are evaluated.
 431  *
 432  * Returns non-zero if the value is changed, zero if not changed.
 433  */
 434 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
 435 {
 436         int changed = 0;
 437         assert(!snd_interval_empty(i));
 438         if (i->min < v->min) {
 439                 i->min = v->min;
 440                 i->openmin = v->openmin;
 441                 changed = 1;
 442         } else if (i->min == v->min && !i->openmin && v->openmin) {
 443                 i->openmin = 1;
 444                 changed = 1;
 445         }
 446         if (i->max > v->max) {
 447                 i->max = v->max;
 448                 i->openmax = v->openmax;
 449                 changed = 1;
 450         } else if (i->max == v->max && !i->openmax && v->openmax) {
 451                 i->openmax = 1;
 452                 changed = 1;
 453         }
 454         if (!i->integer && v->integer) {
 455                 i->integer = 1;
 456                 changed = 1;
 457         }
 458         if (i->integer) {
 459                 if (i->openmin) {
 460                         i->min++;
 461                         i->openmin = 0;
 462                 }
 463                 if (i->openmax) {
 464                         i->max--;
 465                         i->openmax = 0;
 466                 }
 467         } else if (!i->openmin && !i->openmax && i->min == i->max)
 468                 i->integer = 1;
 469         if (snd_interval_checkempty(i)) {
 470                 snd_interval_none(i);
 471                 return -EINVAL;
 472         }
 473         return changed;
 474 }
 475
 476 static int snd_interval_refine_first(struct snd_interval *i)
 477 {
 478         assert(!snd_interval_empty(i));
 479         if (snd_interval_single(i))
 480                 return 0;
 481         i->max = i->min;
 482         i->openmax = i->openmin;
 483         if (i->openmax)
 484                 i->max++;
 485         return 1;
 486 }
 487
 488 static int snd_interval_refine_last(struct snd_interval *i)
 489 {
 490         assert(!snd_interval_empty(i));
 491         if (snd_interval_single(i))
 492                 return 0;
 493         i->min = i->max;
 494         i->openmin = i->openmax;
 495         if (i->openmin)
 496                 i->min--;
 497         return 1;
 498 }
 499
 500 static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
 501 {
 502         struct snd_interval t;
 503         t.empty = 0;
 504         t.min = t.max = val;
 505         t.openmin = t.openmax = 0;
 506         t.integer = 1;
 507         return snd_interval_refine(i, &t);
 508 }
 509
 510 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
 511 {
 512         if (a->empty || b->empty) {
 513                 snd_interval_none(c);
 514                 return;
 515         }
 516         c->empty = 0;
 517         c->min = mul(a->min, b->min);
 518         c->openmin = (a->openmin || b->openmin);
 519         c->max = mul(a->max,  b->max);
 520         c->openmax = (a->openmax || b->openmax);
 521         c->integer = (a->integer && b->integer);
 522 }
 523
 524 /**
 525  * snd_interval_div - refine the interval value with division
 526  * @a: dividend
 527  * @b: divisor
 528  * @c: quotient
 529  *
 530  * c = a / b
 531  *
 532  * Returns non-zero if the value is changed, zero if not changed.
 533  */
 534 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
 535 {
 536         unsigned int r;
 537         if (a->empty || b->empty) {
 538                 snd_interval_none(c);
 539                 return;
 540         }
 541         c->empty = 0;
 542         c->min = div32(a->min, b->max, &r);
 543         c->openmin = (r || a->openmin || b->openmax);
 544         if (b->min > 0) {
 545                 c->max = div32(a->max, b->min, &r);
 546                 if (r) {
 547                         c->max++;
 548                         c->openmax = 1;
 549                 } else
 550                         c->openmax = (a->openmax || b->openmin);
 551         } else {
 552                 c->max = UINT_MAX;
 553                 c->openmax = 0;
 554         }
 555         c->integer = 0;
 556 }
 557
 558 /**
 559  * snd_interval_muldivk - refine the interval value
 560  * @a: dividend 1
 561  * @b: dividend 2
 562  * @k: divisor (as integer)
 563  * @c: result
 564   *
 565  * c = a * b / k
 566  *
 567  * Returns non-zero if the value is changed, zero if not changed.
 568  */
 569 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 570                       unsigned int k, struct snd_interval *c)
 571 {
 572         unsigned int r;
 573         if (a->empty || b->empty) {
 574                 snd_interval_none(c);
 575                 return;
 576         }
 577         c->empty = 0;
 578         c->min = muldiv32(a->min, b->min, k, &r);
 579         c->openmin = (r || a->openmin || b->openmin);
 580         c->max = muldiv32(a->max, b->max, k, &r);
 581         if (r) {
 582                 c->max++;
 583                 c->openmax = 1;
 584         } else
 585                 c->openmax = (a->openmax || b->openmax);
 586         c->integer = 0;
 587 }
 588
 589 /**
 590  * snd_interval_mulkdiv - refine the interval value
 591  * @a: dividend 1
 592  * @k: dividend 2 (as integer)
 593  * @b: divisor
 594  * @c: result
 595  *
 596  * c = a * k / b
 597  *
 598  * Returns non-zero if the value is changed, zero if not changed.
 599  */
 600 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 601                       const struct snd_interval *b, struct snd_interval *c)
 602 {
 603         unsigned int r;
 604         if (a->empty || b->empty) {
 605                 snd_interval_none(c);
 606                 return;
 607         }
 608         c->empty = 0;
 609         c->min = muldiv32(a->min, k, b->max, &r);
 610         c->openmin = (r || a->openmin || b->openmax);
 611         if (b->min > 0) {
 612                 c->max = muldiv32(a->max, k, b->min, &r);
 613                 if (r) {
 614                         c->max++;
 615                         c->openmax = 1;
 616                 } else
 617                         c->openmax = (a->openmax || b->openmin);
 618         } else {
 619                 c->max = UINT_MAX;
 620                 c->openmax = 0;
 621         }
 622         c->integer = 0;
 623 }
 624
 625 #undef assert
 626 /* ---- */
 627
 628
 629 /**
 630  * snd_interval_ratnum - refine the interval value
 631  * @i: interval to refine
 632  * @rats_count: number of ratnum_t
 633  * @rats: ratnum_t array
 634  * @nump: pointer to store the resultant numerator
 635  * @denp: pointer to store the resultant denominator
 636  *
 637  * Returns non-zero if the value is changed, zero if not changed.
 638  */
 639 int snd_interval_ratnum(struct snd_interval *i,
 640                         unsigned int rats_count, struct snd_ratnum *rats,
 641                         unsigned int *nump, unsigned int *denp)
 642 {
 643         unsigned int best_num, best_diff, best_den;
 644         unsigned int k;
 645         struct snd_interval t;
 646         int err;
 647
 648         best_num = best_den = best_diff = 0;
 649         for (k = 0; k < rats_count; ++k) {
 650                 unsigned int num = rats[k].num;
 651                 unsigned int den;
 652                 unsigned int q = i->min;
 653                 int diff;
 654                 if (q == 0)
 655                         q = 1;
 656                 den = div_down(num, q);
 657                 if (den < rats[k].den_min)
 658                         continue;
 659                 if (den > rats[k].den_max)
 660                         den = rats[k].den_max;
 661                 else {
 662                         unsigned int r;
 663                         r = (den - rats[k].den_min) % rats[k].den_step;
 664                         if (r != 0)
 665                                 den -= r;
 666                 }
 667                 diff = num - q * den;
 668                 if (best_num == 0 ||
 669                     diff * best_den < best_diff * den) {
 670                         best_diff = diff;
 671                         best_den = den;
 672                         best_num = num;
 673                 }
 674         }
 675         if (best_den == 0) {
 676                 i->empty = 1;
 677                 return -EINVAL;
 678         }
 679         t.min = div_down(best_num, best_den);
 680         t.openmin = !!(best_num % best_den);
 681
 682         best_num = best_den = best_diff = 0;
 683         for (k = 0; k < rats_count; ++k) {
 684                 unsigned int num = rats[k].num;
 685                 unsigned int den;
 686                 unsigned int q = i->max;
 687                 int diff;
 688                 if (q == 0) {
 689                         i->empty = 1;
 690                         return -EINVAL;
 691                 }
 692                 den = div_up(num, q);
 693                 if (den > rats[k].den_max)
 694                         continue;
 695                 if (den < rats[k].den_min)
 696                         den = rats[k].den_min;
 697                 else {
 698                         unsigned int r;
 699                         r = (den - rats[k].den_min) % rats[k].den_step;
 700                         if (r != 0)
 701                                 den += rats[k].den_step - r;
 702                 }
 703                 diff = q * den - num;
 704                 if (best_num == 0 ||
 705                     diff * best_den < best_diff * den) {
 706                         best_diff = diff;
 707                         best_den = den;
 708                         best_num = num;
 709                 }
 710         }
 711         if (best_den == 0) {
 712                 i->empty = 1;
 713                 return -EINVAL;
 714         }
 715         t.max = div_up(best_num, best_den);
 716         t.openmax = !!(best_num % best_den);
 717         t.integer = 0;
 718         err = snd_interval_refine(i, &t);
 719         if (err < 0)
 720                 return err;
 721
 722         if (snd_interval_single(i)) {
 723                 if (nump)
 724                         *nump = best_num;
 725                 if (denp)
 726                         *denp = best_den;
 727         }
 728         return err;
 729 }
 730
 731 /**
 732  * snd_interval_ratden - refine the interval value
 733  * @i: interval to refine
 734  * @rats_count: number of struct ratden
 735  * @rats: struct ratden array
 736  * @nump: pointer to store the resultant numerator
 737  * @denp: pointer to store the resultant denominator
 738  *
 739  * Returns non-zero if the value is changed, zero if not changed.
 740  */
 741 static int snd_interval_ratden(struct snd_interval *i,
 742                                unsigned int rats_count, struct snd_ratden *rats,
 743                                unsigned int *nump, unsigned int *denp)
 744 {
 745         unsigned int best_num, best_diff, best_den;
 746         unsigned int k;
 747         struct snd_interval t;
 748         int err;
 749
 750         best_num = best_den = best_diff = 0;
 751         for (k = 0; k < rats_count; ++k) {
 752                 unsigned int num;
 753                 unsigned int den = rats[k].den;
 754                 unsigned int q = i->min;
 755                 int diff;
 756                 num = mul(q, den);
 757                 if (num > rats[k].num_max)
 758                         continue;
 759                 if (num < rats[k].num_min)
 760                         num = rats[k].num_max;
 761                 else {
 762                         unsigned int r;
 763                         r = (num - rats[k].num_min) % rats[k].num_step;
 764                         if (r != 0)
 765                                 num += rats[k].num_step - r;
 766                 }
 767                 diff = num - q * den;
 768                 if (best_num == 0 ||
 769                     diff * best_den < best_diff * den) {
 770                         best_diff = diff;
 771                         best_den = den;
 772                         best_num = num;
 773                 }
 774         }
 775         if (best_den == 0) {
 776                 i->empty = 1;
 777                 return -EINVAL;
 778         }
 779         t.min = div_down(best_num, best_den);
 780         t.openmin = !!(best_num % best_den);
 781
 782         best_num = best_den = best_diff = 0;
 783         for (k = 0; k < rats_count; ++k) {
 784                 unsigned int num;
 785                 unsigned int den = rats[k].den;
 786                 unsigned int q = i->max;
 787                 int diff;
 788                 num = mul(q, den);
 789                 if (num < rats[k].num_min)
 790                         continue;
 791                 if (num > rats[k].num_max)
 792                         num = rats[k].num_max;
 793                 else {
 794                         unsigned int r;
 795                         r = (num - rats[k].num_min) % rats[k].num_step;
 796                         if (r != 0)
 797                                 num -= r;
 798                 }
 799                 diff = q * den - num;
 800                 if (best_num == 0 ||
 801                     diff * best_den < best_diff * den) {
 802                         best_diff = diff;
 803                         best_den = den;
 804                         best_num = num;
 805                 }
 806         }
 807         if (best_den == 0) {
 808                 i->empty = 1;
 809                 return -EINVAL;
 810         }
 811         t.max = div_up(best_num, best_den);
 812         t.openmax = !!(best_num % best_den);
 813         t.integer = 0;
 814         err = snd_interval_refine(i, &t);
 815         if (err < 0)
 816                 return err;
 817
 818         if (snd_interval_single(i)) {
 819                 if (nump)
 820                         *nump = best_num;
 821                 if (denp)
 822                         *denp = best_den;
 823         }
 824         return err;
 825 }
 826
 827 /**
 828  * snd_interval_list - refine the interval value from the list
 829  * @i: the interval value to refine
 830  * @count: the number of elements in the list
 831  * @list: the value list
 832  * @mask: the bit-mask to evaluate
 833  *
 834  * Refines the interval value from the list.
 835  * When mask is non-zero, only the elements corresponding to bit 1 are
 836  * evaluated.
 837  *
 838  * Returns non-zero if the value is changed, zero if not changed.
 839  */
 840 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
 841 {
 842         unsigned int k;
 843         int changed = 0;
 844         for (k = 0; k < count; k++) {
 845                 if (mask && !(mask & (1 << k)))
 846                         continue;
 847                 if (i->min == list[k] && !i->openmin)
 848                         goto _l1;
 849                 if (i->min < list[k]) {
 850                         i->min = list[k];
 851                         i->openmin = 0;
 852                         changed = 1;
 853                         goto _l1;
 854                 }
 855         }
 856         i->empty = 1;
 857         return -EINVAL;
 858  _l1:
 859         for (k = count; k-- > 0;) {
 860                 if (mask && !(mask & (1 << k)))
 861                         continue;
 862                 if (i->max == list[k] && !i->openmax)
 863                         goto _l2;
 864                 if (i->max > list[k]) {
 865                         i->max = list[k];
 866                         i->openmax = 0;
 867                         changed = 1;
 868                         goto _l2;
 869                 }
 870         }
 871         i->empty = 1;
 872         return -EINVAL;
 873  _l2:
 874         if (snd_interval_checkempty(i)) {
 875                 i->empty = 1;
 876                 return -EINVAL;
 877         }
 878         return changed;
 879 }
 880
 881 static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
 882 {
 883         unsigned int n;
 884         int changed = 0;
 885         n = (i->min - min) % step;
 886         if (n != 0 || i->openmin) {
 887                 i->min += step - n;
 888                 changed = 1;
 889         }
 890         n = (i->max - min) % step;
 891         if (n != 0 || i->openmax) {
 892                 i->max -= n;
 893                 changed = 1;
 894         }
 895         if (snd_interval_checkempty(i)) {
 896                 i->empty = 1;
 897                 return -EINVAL;
 898         }
 899         return changed;
 900 }
 901
 902 /* Info constraints helpers */
 903
 904 /**
 905  * snd_pcm_hw_rule_add - add the hw-constraint rule
 906  * @runtime: the pcm runtime instance
 907  * @cond: condition bits
 908  * @var: the variable to evaluate
 909  * @func: the evaluation function
 910  * @private: the private data pointer passed to function
 911  * @dep: the dependent variables
 912  *
 913  * Returns zero if successful, or a negative error code on failure.
 914  */
 915 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
 916                         int var,
 917                         snd_pcm_hw_rule_func_t func, void *private,
 918                         int dep, ...)
 919 {
 920         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
 921         struct snd_pcm_hw_rule *c;
 922         unsigned int k;
 923         va_list args;
 924         va_start(args, dep);
 925         if (constrs->rules_num >= constrs->rules_all) {
 926                 struct snd_pcm_hw_rule *new;
 927                 unsigned int new_rules = constrs->rules_all + 16;
 928                 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
 929                 if (!new)
 930                         return -ENOMEM;
 931                 if (constrs->rules) {
 932                         memcpy(new, constrs->rules,
 933                                constrs->rules_num * sizeof(*c));
 934                         kfree(constrs->rules);
 935                 }
 936                 constrs->rules = new;
 937                 constrs->rules_all = new_rules;
 938         }
 939         c = &constrs->rules[constrs->rules_num];
 940         c->cond = cond;
 941         c->func = func;
 942         c->var = var;
 943         c->private = private;
 944         k = 0;
 945         while (1) {
 946                 snd_assert(k < ARRAY_SIZE(c->deps), return -EINVAL);
 947                 c->deps[k++] = dep;
 948                 if (dep < 0)
 949                         break;
 950                 dep = va_arg(args, int);
 951         }
 952         constrs->rules_num++;
 953         va_end(args);
 954         return 0;
 955 }
 956
 957 /**
 958  * snd_pcm_hw_constraint_mask
 959  * @runtime: PCM runtime instance
 960  * @var: hw_params variable to apply the mask
 961  * @mask: the bitmap mask
 962  *
 963  * Apply the constraint of the given bitmap mask to a mask parameter.
 964  */
 965 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 966                                u_int32_t mask)
 967 {
 968         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
 969         struct snd_mask *maskp = constrs_mask(constrs, var);
 970         *maskp->bits &= mask;
 971         memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
 972         if (*maskp->bits == 0)
 973                 return -EINVAL;
 974         return 0;
 975 }
 976
 977 /**
 978  * snd_pcm_hw_constraint_mask64
 979  * @runtime: PCM runtime instance
 980  * @var: hw_params variable to apply the mask
 981  * @mask: the 64bit bitmap mask
 982  *
 983  * Apply the constraint of the given bitmap mask to a mask parameter.
 984  */
 985 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 986                                  u_int64_t mask)
 987 {
 988         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
 989         struct snd_mask *maskp = constrs_mask(constrs, var);
 990         maskp->bits[0] &= (u_int32_t)mask;
 991         maskp->bits[1] &= (u_int32_t)(mask >> 32);
 992         memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
 993         if (! maskp->bits[0] && ! maskp->bits[1])
 994                 return -EINVAL;
 995         return 0;
 996 }
 997
 998 /**
 999  * snd_pcm_hw_constraint_integer
1000  * @runtime: PCM runtime instance
1001  * @var: hw_params variable to apply the integer constraint
1002  *
1003  * Apply the constraint of integer to an interval parameter.
1004  */
1005 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1006 {
1007         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1008         return snd_interval_setinteger(constrs_interval(constrs, var));
1009 }
1010
1011 /**
1012  * snd_pcm_hw_constraint_minmax
1013  * @runtime: PCM runtime instance
1014  * @var: hw_params variable to apply the range
1015  * @min: the minimal value
1016  * @max: the maximal value
1017  *
1018  * Apply the min/max range constraint to an interval parameter.
1019  */
1020 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1021                                  unsigned int min, unsigned int max)
1022 {
1023         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1024         struct snd_interval t;
1025         t.min = min;
1026         t.max = max;
1027         t.openmin = t.openmax = 0;
1028         t.integer = 0;
1029         return snd_interval_refine(constrs_interval(constrs, var), &t);
1030 }
1031
1032 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1033                                 struct snd_pcm_hw_rule *rule)
1034 {
1035         struct snd_pcm_hw_constraint_list *list = rule->private;
1036         return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1037 }
1038
1039
1040 /**
1041  * snd_pcm_hw_constraint_list
1042  * @runtime: PCM runtime instance
1043  * @cond: condition bits
1044  * @var: hw_params variable to apply the list constraint
1045  * @l: list
1046  *
1047  * Apply the list of constraints to an interval parameter.
1048  */
1049 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1050                                unsigned int cond,
1051                                snd_pcm_hw_param_t var,
1052                                struct snd_pcm_hw_constraint_list *l)
1053 {
1054         return snd_pcm_hw_rule_add(runtime, cond, var,
1055                                    snd_pcm_hw_rule_list, l,
1056                                    var, -1);
1057 }
1058
1059 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1060                                    struct snd_pcm_hw_rule *rule)
1061 {
1062         struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1063         unsigned int num = 0, den = 0;
1064         int err;
1065         err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1066                                   r->nrats, r->rats, &num, &den);
1067         if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1068                 params->rate_num = num;
1069                 params->rate_den = den;
1070         }
1071         return err;
1072 }
1073
1074 /**
1075  * snd_pcm_hw_constraint_ratnums
1076  * @runtime: PCM runtime instance
1077  * @cond: condition bits
1078  * @var: hw_params variable to apply the ratnums constraint
1079  * @r: struct snd_ratnums constriants
1080  */
1081 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1082                                   unsigned int cond,
1083                                   snd_pcm_hw_param_t var,
1084                                   struct snd_pcm_hw_constraint_ratnums *r)
1085 {
1086         return snd_pcm_hw_rule_add(runtime, cond, var,
1087                                    snd_pcm_hw_rule_ratnums, r,
1088                                    var, -1);
1089 }
1090
1091 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1092                                    struct snd_pcm_hw_rule *rule)
1093 {
1094         struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1095         unsigned int num = 0, den = 0;
1096         int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1097                                   r->nrats, r->rats, &num, &den);
1098         if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1099                 params->rate_num = num;
1100                 params->rate_den = den;
1101         }
1102         return err;
1103 }
1104
1105 /**
1106  * snd_pcm_hw_constraint_ratdens
1107  * @runtime: PCM runtime instance
1108  * @cond: condition bits
1109  * @var: hw_params variable to apply the ratdens constraint
1110  * @r: struct snd_ratdens constriants
1111  */
1112 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1113                                   unsigned int cond,
1114                                   snd_pcm_hw_param_t var,
1115                                   struct snd_pcm_hw_constraint_ratdens *r)
1116 {
1117         return snd_pcm_hw_rule_add(runtime, cond, var,
1118                                    snd_pcm_hw_rule_ratdens, r,
1119                                    var, -1);
1120 }
1121
1122 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1123                                   struct snd_pcm_hw_rule *rule)
1124 {
1125         unsigned int l = (unsigned long) rule->private;
1126         int width = l & 0xffff;
1127         unsigned int msbits = l >> 16;
1128         struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1129         if (snd_interval_single(i) && snd_interval_value(i) == width)
1130                 params->msbits = msbits;
1131         return 0;
1132 }
1133
1134 /**
1135  * snd_pcm_hw_constraint_msbits
1136  * @runtime: PCM runtime instance
1137  * @cond: condition bits
1138  * @width: sample bits width
1139  * @msbits: msbits width
1140  */
1141 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1142                                  unsigned int cond,
1143                                  unsigned int width,
1144                                  unsigned int msbits)
1145 {
1146         unsigned long l = (msbits << 16) | width;
1147         return snd_pcm_hw_rule_add(runtime, cond, -1,
1148                                     snd_pcm_hw_rule_msbits,
1149                                     (void*) l,
1150                                     SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1151 }
1152
1153 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1154                                 struct snd_pcm_hw_rule *rule)
1155 {
1156         unsigned long step = (unsigned long) rule->private;
1157         return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1158 }
1159
1160 /**
1161  * snd_pcm_hw_constraint_step
1162  * @runtime: PCM runtime instance
1163  * @cond: condition bits
1164  * @var: hw_params variable to apply the step constraint
1165  * @step: step size
1166  */
1167 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1168                                unsigned int cond,
1169                                snd_pcm_hw_param_t var,
1170                                unsigned long step)
1171 {
1172         return snd_pcm_hw_rule_add(runtime, cond, var,
1173                                    snd_pcm_hw_rule_step, (void *) step,
1174                                    var, -1);
1175 }
1176
1177 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1178 {
1179         static int pow2_sizes[] = {
1180                 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1181                 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1182                 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1183                 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1184         };
1185         return snd_interval_list(hw_param_interval(params, rule->var),
1186                                  ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1187 }
1188
1189 /**
1190  * snd_pcm_hw_constraint_pow2
1191  * @runtime: PCM runtime instance
1192  * @cond: condition bits
1193  * @var: hw_params variable to apply the power-of-2 constraint
1194  */
1195 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1196                                unsigned int cond,
1197                                snd_pcm_hw_param_t var)
1198 {
1199         return snd_pcm_hw_rule_add(runtime, cond, var,
1200                                    snd_pcm_hw_rule_pow2, NULL,
1201                                    var, -1);
1202 }
1203
1204 /* To use the same code we have in alsa-lib */
1205 #define assert(i) snd_assert((i), return -EINVAL)
1206 #ifndef INT_MIN
1207 #define INT_MIN ((int)((unsigned int)INT_MAX+1))
1208 #endif
1209
1210 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1211                                   snd_pcm_hw_param_t var)
1212 {
1213         if (hw_is_mask(var)) {
1214                 snd_mask_any(hw_param_mask(params, var));
1215                 params->cmask |= 1 << var;
1216                 params->rmask |= 1 << var;
1217                 return;
1218         }
1219         if (hw_is_interval(var)) {
1220                 snd_interval_any(hw_param_interval(params, var));
1221                 params->cmask |= 1 << var;
1222                 params->rmask |= 1 << var;
1223                 return;
1224         }
1225         snd_BUG();
1226 }
1227
1228 #if 0
1229 /*
1230  * snd_pcm_hw_param_any
1231  */
1232 int snd_pcm_hw_param_any(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params,
1233                          snd_pcm_hw_param_t var)
1234 {
1235         _snd_pcm_hw_param_any(params, var);
1236         return snd_pcm_hw_refine(pcm, params);
1237 }
1238 #endif  /*  0  */
1239
1240 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1241 {
1242         unsigned int k;
1243         memset(params, 0, sizeof(*params));
1244         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1245                 _snd_pcm_hw_param_any(params, k);
1246         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1247                 _snd_pcm_hw_param_any(params, k);
1248         params->info = ~0U;
1249 }
1250
1251 #if 0
1252 /*
1253  * snd_pcm_hw_params_any
1254  *
1255  * Fill PARAMS with full configuration space boundaries
1256  */
1257 int snd_pcm_hw_params_any(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params)
1258 {
1259         _snd_pcm_hw_params_any(params);
1260         return snd_pcm_hw_refine(pcm, params);
1261 }
1262 #endif  /*  0  */
1263
1264 /**
1265  * snd_pcm_hw_param_value
1266  * @params: the hw_params instance
1267  * @var: parameter to retrieve
1268  * @dir: pointer to the direction (-1,0,1) or NULL
1269  *
1270  * Return the value for field PAR if it's fixed in configuration space
1271  *  defined by PARAMS. Return -EINVAL otherwise
1272  */
1273 static int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1274                                   snd_pcm_hw_param_t var, int *dir)
1275 {
1276         if (hw_is_mask(var)) {
1277                 const struct snd_mask *mask = hw_param_mask_c(params, var);
1278                 if (!snd_mask_single(mask))
1279                         return -EINVAL;
1280                 if (dir)
1281                         *dir = 0;
1282                 return snd_mask_value(mask);
1283         }
1284         if (hw_is_interval(var)) {
1285                 const struct snd_interval *i = hw_param_interval_c(params, var);
1286                 if (!snd_interval_single(i))
1287                         return -EINVAL;
1288                 if (dir)
1289                         *dir = i->openmin;
1290                 return snd_interval_value(i);
1291         }
1292         assert(0);
1293         return -EINVAL;
1294 }
1295
1296 /**
1297  * snd_pcm_hw_param_value_min
1298  * @params: the hw_params instance
1299  * @var: parameter to retrieve
1300  * @dir: pointer to the direction (-1,0,1) or NULL
1301  *
1302  * Return the minimum value for field PAR.
1303  */
1304 unsigned int snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params,
1305                                         snd_pcm_hw_param_t var, int *dir)
1306 {
1307         if (hw_is_mask(var)) {
1308                 if (dir)
1309                         *dir = 0;
1310                 return snd_mask_min(hw_param_mask_c(params, var));
1311         }
1312         if (hw_is_interval(var)) {
1313                 const struct snd_interval *i = hw_param_interval_c(params, var);
1314                 if (dir)
1315                         *dir = i->openmin;
1316                 return snd_interval_min(i);
1317         }
1318         assert(0);
1319         return -EINVAL;
1320 }
1321
1322 /**
1323  * snd_pcm_hw_param_value_max
1324  * @params: the hw_params instance
1325  * @var: parameter to retrieve
1326  * @dir: pointer to the direction (-1,0,1) or NULL
1327  *
1328  * Return the maximum value for field PAR.
1329  */
1330 unsigned int snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params,
1331                                         snd_pcm_hw_param_t var, int *dir)
1332 {
1333         if (hw_is_mask(var)) {
1334                 if (dir)
1335                         *dir = 0;
1336                 return snd_mask_max(hw_param_mask_c(params, var));
1337         }
1338         if (hw_is_interval(var)) {
1339                 const struct snd_interval *i = hw_param_interval_c(params, var);
1340                 if (dir)
1341                         *dir = - (int) i->openmax;
1342                 return snd_interval_max(i);
1343         }
1344         assert(0);
1345         return -EINVAL;
1346 }
1347
1348 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1349                                 snd_pcm_hw_param_t var)
1350 {
1351         if (hw_is_mask(var)) {
1352                 snd_mask_none(hw_param_mask(params, var));
1353                 params->cmask |= 1 << var;
1354                 params->rmask |= 1 << var;
1355         } else if (hw_is_interval(var)) {
1356                 snd_interval_none(hw_param_interval(params, var));
1357                 params->cmask |= 1 << var;
1358                 params->rmask |= 1 << var;
1359         } else {
1360                 snd_BUG();
1361         }
1362 }
1363
1364 int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
1365                                  snd_pcm_hw_param_t var)
1366 {
1367         int changed;
1368         assert(hw_is_interval(var));
1369         changed = snd_interval_setinteger(hw_param_interval(params, var));
1370         if (changed) {
1371                 params->cmask |= 1 << var;
1372                 params->rmask |= 1 << var;
1373         }
1374         return changed;
1375 }
1376
1377 #if 0
1378 /*
1379  * snd_pcm_hw_param_setinteger
1380  *
1381  * Inside configuration space defined by PARAMS remove from PAR all
1382  * non integer values. Reduce configuration space accordingly.
1383  * Return -EINVAL if the configuration space is empty
1384  */
1385 int snd_pcm_hw_param_setinteger(struct snd_pcm_substream *pcm,
1386                                 struct snd_pcm_hw_params *params,
1387                                 snd_pcm_hw_param_t var)
1388 {
1389         int changed = _snd_pcm_hw_param_setinteger(params, var);
1390         if (changed < 0)
1391                 return changed;
1392         if (params->rmask) {
1393                 int err = snd_pcm_hw_refine(pcm, params);
1394                 if (err < 0)
1395                         return err;
1396         }
1397         return 0;
1398 }
1399 #endif  /*  0  */
1400
1401 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1402                                    snd_pcm_hw_param_t var)
1403 {
1404         int changed;
1405         if (hw_is_mask(var))
1406                 changed = snd_mask_refine_first(hw_param_mask(params, var));
1407         else if (hw_is_interval(var))
1408                 changed = snd_interval_refine_first(hw_param_interval(params, var));
1409         else {
1410                 assert(0);
1411                 return -EINVAL;
1412         }
1413         if (changed) {
1414                 params->cmask |= 1 << var;
1415                 params->rmask |= 1 << var;
1416         }
1417         return changed;
1418 }
1419
1420
1421 /**
1422  * snd_pcm_hw_param_first
1423  * @pcm: PCM instance
1424  * @params: the hw_params instance
1425  * @var: parameter to retrieve
1426  * @dir: pointer to the direction (-1,0,1) or NULL
1427  *
1428  * Inside configuration space defined by PARAMS remove from PAR all
1429  * values > minimum. Reduce configuration space accordingly.
1430  * Return the minimum.
1431  */
1432 static int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1433                                   struct snd_pcm_hw_params *params,
1434                                   snd_pcm_hw_param_t var, int *dir)
1435 {
1436         int changed = _snd_pcm_hw_param_first(params, var);
1437         if (changed < 0)
1438                 return changed;
1439         if (params->rmask) {
1440                 int err = snd_pcm_hw_refine(pcm, params);
1441                 assert(err >= 0);
1442         }
1443         return snd_pcm_hw_param_value(params, var, dir);
1444 }
1445
1446 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1447                                   snd_pcm_hw_param_t var)
1448 {
1449         int changed;
1450         if (hw_is_mask(var))
1451                 changed = snd_mask_refine_last(hw_param_mask(params, var));
1452         else if (hw_is_interval(var))
1453                 changed = snd_interval_refine_last(hw_param_interval(params, var));
1454         else {
1455                 assert(0);
1456                 return -EINVAL;
1457         }
1458         if (changed) {
1459                 params->cmask |= 1 << var;
1460                 params->rmask |= 1 << var;
1461         }
1462         return changed;
1463 }
1464
1465
1466 /**
1467  * snd_pcm_hw_param_last
1468  * @pcm: PCM instance
1469  * @params: the hw_params instance
1470  * @var: parameter to retrieve
1471  * @dir: pointer to the direction (-1,0,1) or NULL
1472  *
1473  * Inside configuration space defined by PARAMS remove from PAR all
1474  * values < maximum. Reduce configuration space accordingly.
1475  * Return the maximum.
1476  */
1477 static int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1478                                  struct snd_pcm_hw_params *params,
1479                                  snd_pcm_hw_param_t var, int *dir)
1480 {
1481         int changed = _snd_pcm_hw_param_last(params, var);
1482         if (changed < 0)
1483                 return changed;
1484         if (params->rmask) {
1485                 int err = snd_pcm_hw_refine(pcm, params);
1486                 assert(err >= 0);
1487         }
1488         return snd_pcm_hw_param_value(params, var, dir);
1489 }
1490
1491 int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
1492                           snd_pcm_hw_param_t var, unsigned int val, int dir)
1493 {
1494         int changed;
1495         int open = 0;
1496         if (dir) {
1497                 if (dir > 0) {
1498                         open = 1;
1499                 } else if (dir < 0) {
1500                         if (val > 0) {
1501                                 open = 1;
1502                                 val--;
1503                         }
1504                 }
1505         }
1506         if (hw_is_mask(var))
1507                 changed = snd_mask_refine_min(hw_param_mask(params, var), val + !!open);
1508         else if (hw_is_interval(var))
1509                 changed = snd_interval_refine_min(hw_param_interval(params, var), val, open);
1510         else {
1511                 assert(0);
1512                 return -EINVAL;
1513         }
1514         if (changed) {
1515                 params->cmask |= 1 << var;
1516                 params->rmask |= 1 << var;
1517         }
1518         return changed;
1519 }
1520
1521 /**
1522  * snd_pcm_hw_param_min
1523  * @pcm: PCM instance
1524  * @params: the hw_params instance
1525  * @var: parameter to retrieve
1526  * @val: minimal value
1527  * @dir: pointer to the direction (-1,0,1) or NULL
1528  *
1529  * Inside configuration space defined by PARAMS remove from PAR all
1530  * values < VAL. Reduce configuration space accordingly.
1531  * Return new minimum or -EINVAL if the configuration space is empty
1532  */
1533 static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params,
1534                                 snd_pcm_hw_param_t var, unsigned int val,
1535                                 int *dir)
1536 {
1537         int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
1538         if (changed < 0)
1539                 return changed;
1540         if (params->rmask) {
1541                 int err = snd_pcm_hw_refine(pcm, params);
1542                 if (err < 0)
1543                         return err;
1544         }
1545         return snd_pcm_hw_param_value_min(params, var, dir);
1546 }
1547
1548 static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params,
1549                                  snd_pcm_hw_param_t var, unsigned int val,
1550                                  int dir)
1551 {
1552         int changed;
1553         int open = 0;
1554         if (dir) {
1555                 if (dir < 0) {
1556                         open = 1;
1557                 } else if (dir > 0) {
1558                         open = 1;
1559                         val++;
1560                 }
1561         }
1562         if (hw_is_mask(var)) {
1563                 if (val == 0 && open) {
1564                         snd_mask_none(hw_param_mask(params, var));
1565                         changed = -EINVAL;
1566                 } else
1567                         changed = snd_mask_refine_max(hw_param_mask(params, var), val - !!open);
1568         } else if (hw_is_interval(var))
1569                 changed = snd_interval_refine_max(hw_param_interval(params, var), val, open);
1570         else {
1571                 assert(0);
1572                 return -EINVAL;
1573         }
1574         if (changed) {
1575                 params->cmask |= 1 << var;
1576                 params->rmask |= 1 << var;
1577         }
1578         return changed;
1579 }
1580
1581 /**
1582  * snd_pcm_hw_param_max
1583  * @pcm: PCM instance
1584  * @params: the hw_params instance
1585  * @var: parameter to retrieve
1586  * @val: maximal value
1587  * @dir: pointer to the direction (-1,0,1) or NULL
1588  *
1589  * Inside configuration space defined by PARAMS remove from PAR all
1590  *  values >= VAL + 1. Reduce configuration space accordingly.
1591  *  Return new maximum or -EINVAL if the configuration space is empty
1592  */
1593 static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params,
1594                                 snd_pcm_hw_param_t var, unsigned int val,
1595                                 int *dir)
1596 {
1597         int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
1598         if (changed < 0)
1599                 return changed;
1600         if (params->rmask) {
1601                 int err = snd_pcm_hw_refine(pcm, params);
1602                 if (err < 0)
1603                         return err;
1604         }
1605         return snd_pcm_hw_param_value_max(params, var, dir);
1606 }
1607
1608 int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
1609                           snd_pcm_hw_param_t var, unsigned int val, int dir)
1610 {
1611         int changed;
1612         if (hw_is_mask(var)) {
1613                 struct snd_mask *m = hw_param_mask(params, var);
1614                 if (val == 0 && dir < 0) {
1615                         changed = -EINVAL;
1616                         snd_mask_none(m);
1617                 } else {
1618                         if (dir > 0)
1619                                 val++;
1620                         else if (dir < 0)
1621                                 val--;
1622                         changed = snd_mask_refine_set(hw_param_mask(params, var), val);
1623                 }
1624         } else if (hw_is_interval(var)) {
1625                 struct snd_interval *i = hw_param_interval(params, var);
1626                 if (val == 0 && dir < 0) {
1627                         changed = -EINVAL;
1628                         snd_interval_none(i);
1629                 } else if (dir == 0)
1630                         changed = snd_interval_refine_set(i, val);
1631                 else {
1632                         struct snd_interval t;
1633                         t.openmin = 1;
1634                         t.openmax = 1;
1635                         t.empty = 0;
1636                         t.integer = 0;
1637                         if (dir < 0) {
1638                                 t.min = val - 1;
1639                                 t.max = val;
1640                         } else {
1641                                 t.min = val;
1642                                 t.max = val+1;
1643                         }
1644                         changed = snd_interval_refine(i, &t);
1645                 }
1646         } else {
1647                 assert(0);
1648                 return -EINVAL;
1649         }
1650         if (changed) {
1651                 params->cmask |= 1 << var;
1652                 params->rmask |= 1 << var;
1653         }
1654         return changed;
1655 }
1656
1657 /**
1658  * snd_pcm_hw_param_set
1659  * @pcm: PCM instance
1660  * @params: the hw_params instance
1661  * @var: parameter to retrieve
1662  * @val: value to set
1663  * @dir: pointer to the direction (-1,0,1) or NULL
1664  *
1665  * Inside configuration space defined by PARAMS remove from PAR all
1666  * values != VAL. Reduce configuration space accordingly.
1667  *  Return VAL or -EINVAL if the configuration space is empty
1668  */
1669 int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params,
1670                          snd_pcm_hw_param_t var, unsigned int val, int dir)
1671 {
1672         int changed = _snd_pcm_hw_param_set(params, var, val, dir);
1673         if (changed < 0)
1674                 return changed;
1675         if (params->rmask) {
1676                 int err = snd_pcm_hw_refine(pcm, params);
1677                 if (err < 0)
1678                         return err;
1679         }
1680         return snd_pcm_hw_param_value(params, var, NULL);
1681 }
1682
1683 static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
1684                                   snd_pcm_hw_param_t var, const struct snd_mask *val)
1685 {
1686         int changed;
1687         assert(hw_is_mask(var));
1688         changed = snd_mask_refine(hw_param_mask(params, var), val);
1689         if (changed) {
1690                 params->cmask |= 1 << var;
1691                 params->rmask |= 1 << var;
1692         }
1693         return changed;
1694 }
1695
1696 /**
1697  * snd_pcm_hw_param_mask
1698  * @pcm: PCM instance
1699  * @params: the hw_params instance
1700  * @var: parameter to retrieve
1701  * @val: mask to apply
1702  *
1703  * Inside configuration space defined by PARAMS remove from PAR all values
1704  * not contained in MASK. Reduce configuration space accordingly.
1705  * This function can be called only for SNDRV_PCM_HW_PARAM_ACCESS,
1706  * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
1707  * Return 0 on success or -EINVAL
1708  * if the configuration space is empty
1709  */
1710 int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params,
1711                           snd_pcm_hw_param_t var, const struct snd_mask *val)
1712 {
1713         int changed = _snd_pcm_hw_param_mask(params, var, val);
1714         if (changed < 0)
1715                 return changed;
1716         if (params->rmask) {
1717                 int err = snd_pcm_hw_refine(pcm, params);
1718                 if (err < 0)
1719                         return err;
1720         }
1721         return 0;
1722 }
1723
1724 static int boundary_sub(int a, int adir,
1725                         int b, int bdir,
1726                         int *c, int *cdir)
1727 {
1728         adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
1729         bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
1730         *c = a - b;
1731         *cdir = adir - bdir;
1732         if (*cdir == -2) {
1733                 assert(*c > INT_MIN);
1734                 (*c)--;
1735         } else if (*cdir == 2) {
1736                 assert(*c < INT_MAX);
1737                 (*c)++;
1738         }
1739         return 0;
1740 }
1741
1742 static int boundary_lt(unsigned int a, int adir,
1743                        unsigned int b, int bdir)
1744 {
1745         assert(a > 0 || adir >= 0);
1746         assert(b > 0 || bdir >= 0);
1747         if (adir < 0) {
1748                 a--;
1749                 adir = 1;
1750         } else if (adir > 0)
1751                 adir = 1;
1752         if (bdir < 0) {
1753                 b--;
1754                 bdir = 1;
1755         } else if (bdir > 0)
1756                 bdir = 1;
1757         return a < b || (a == b && adir < bdir);
1758 }
1759
1760 /* Return 1 if min is nearer to best than max */
1761 static int boundary_nearer(int min, int mindir,
1762                            int best, int bestdir,
1763                            int max, int maxdir)
1764 {
1765         int dmin, dmindir;
1766         int dmax, dmaxdir;
1767         boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
1768         boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
1769         return boundary_lt(dmin, dmindir, dmax, dmaxdir);
1770 }
1771
1772 /**
1773  * snd_pcm_hw_param_near
1774  * @pcm: PCM instance
1775  * @params: the hw_params instance
1776  * @var: parameter to retrieve
1777  * @best: value to set
1778  * @dir: pointer to the direction (-1,0,1) or NULL
1779  *
1780  * Inside configuration space defined by PARAMS set PAR to the available value
1781  * nearest to VAL. Reduce configuration space accordingly.
1782  * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
1783  * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
1784  * Return the value found.
1785   */
1786 int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params,
1787                           snd_pcm_hw_param_t var, unsigned int best, int *dir)
1788 {
1789         struct snd_pcm_hw_params *save = NULL;
1790         int v;
1791         unsigned int saved_min;
1792         int last = 0;
1793         int min, max;
1794         int mindir, maxdir;
1795         int valdir = dir ? *dir : 0;
1796         /* FIXME */
1797         if (best > INT_MAX)
1798                 best = INT_MAX;
1799         min = max = best;
1800         mindir = maxdir = valdir;
1801         if (maxdir > 0)
1802                 maxdir = 0;
1803         else if (maxdir == 0)
1804                 maxdir = -1;
1805         else {
1806                 maxdir = 1;
1807                 max--;
1808         }
1809         save = kmalloc(sizeof(*save), GFP_KERNEL);
1810         if (save == NULL)
1811                 return -ENOMEM;
1812         *save = *params;
1813         saved_min = min;
1814         min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
1815         if (min >= 0) {
1816                 struct snd_pcm_hw_params *params1;
1817                 if (max < 0)
1818                         goto _end;
1819                 if ((unsigned int)min == saved_min && mindir == valdir)
1820                         goto _end;
1821                 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
1822                 if (params1 == NULL) {
1823                         kfree(save);
1824                         return -ENOMEM;
1825                 }
1826                 *params1 = *save;
1827                 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
1828                 if (max < 0) {
1829                         kfree(params1);
1830                         goto _end;
1831                 }
1832                 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
1833                         *params = *params1;
1834                         last = 1;
1835                 }
1836                 kfree(params1);
1837         } else {
1838                 *params = *save;
1839                 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
1840                 assert(max >= 0);
1841                 last = 1;
1842         }
1843  _end:
1844         kfree(save);
1845         if (last)
1846                 v = snd_pcm_hw_param_last(pcm, params, var, dir);
1847         else
1848                 v = snd_pcm_hw_param_first(pcm, params, var, dir);
1849         assert(v >= 0);
1850         return v;
1851 }
1852
1853 /**
1854  * snd_pcm_hw_param_choose
1855  * @pcm: PCM instance
1856  * @params: the hw_params instance
1857  *
1858  * Choose one configuration from configuration space defined by PARAMS
1859  * The configuration chosen is that obtained fixing in this order:
1860  * first access, first format, first subformat, min channels,
1861  * min rate, min period time, max buffer size, min tick time
1862  */
1863 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params)
1864 {
1865         int err;
1866
1867         err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_ACCESS, NULL);
1868         assert(err >= 0);
1869
1870         err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_FORMAT, NULL);
1871         assert(err >= 0);
1872
1873         err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_SUBFORMAT, NULL);
1874         assert(err >= 0);
1875
1876         err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_CHANNELS, NULL);
1877         assert(err >= 0);
1878
1879         err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_RATE, NULL);
1880         assert(err >= 0);
1881
1882         err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_PERIOD_TIME, NULL);
1883         assert(err >= 0);
1884
1885         err = snd_pcm_hw_param_last(pcm, params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL);
1886         assert(err >= 0);
1887
1888         err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_TICK_TIME, NULL);
1889         assert(err >= 0);
1890
1891         return 0;
1892 }
1893
1894 #undef assert
1895
1896 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1897                                    void *arg)
1898 {
1899         struct snd_pcm_runtime *runtime = substream->runtime;
1900         unsigned long flags;
1901         snd_pcm_stream_lock_irqsave(substream, flags);
1902         if (snd_pcm_running(substream) &&
1903             snd_pcm_update_hw_ptr(substream) >= 0)
1904                 runtime->status->hw_ptr %= runtime->buffer_size;
1905         else
1906                 runtime->status->hw_ptr = 0;
1907         snd_pcm_stream_unlock_irqrestore(substream, flags);
1908         return 0;
1909 }
1910
1911 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1912                                           void *arg)
1913 {
1914         struct snd_pcm_channel_info *info = arg;
1915         struct snd_pcm_runtime *runtime = substream->runtime;
1916         int width;
1917         if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1918                 info->offset = -1;
1919                 return 0;
1920         }
1921         width = snd_pcm_format_physical_width(runtime->format);
1922         if (width < 0)
1923                 return width;
1924         info->offset = 0;
1925         switch (runtime->access) {
1926         case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1927         case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1928                 info->first = info->channel * width;
1929                 info->step = runtime->channels * width;
1930                 break;
1931         case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1932         case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1933         {
1934                 size_t size = runtime->dma_bytes / runtime->channels;
1935                 info->first = info->channel * size * 8;
1936                 info->step = width;
1937                 break;
1938         }
1939         default:
1940                 snd_BUG();
1941                 break;
1942         }
1943         return 0;
1944 }
1945
1946 /**
1947  * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1948  * @substream: the pcm substream instance
1949  * @cmd: ioctl command
1950  * @arg: ioctl argument
1951  *
1952  * Processes the generic ioctl commands for PCM.
1953  * Can be passed as the ioctl callback for PCM ops.
1954  *
1955  * Returns zero if successful, or a negative error code on failure.
1956  */
1957 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1958                       unsigned int cmd, void *arg)
1959 {
1960         switch (cmd) {
1961         case SNDRV_PCM_IOCTL1_INFO:
1962                 return 0;
1963         case SNDRV_PCM_IOCTL1_RESET:
1964                 return snd_pcm_lib_ioctl_reset(substream, arg);
1965         case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1966                 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1967         }
1968         return -ENXIO;
1969 }
1970
1971 /*
1972  *  Conditions
1973  */
1974
1975 static void snd_pcm_system_tick_set(struct snd_pcm_substream *substream,
1976                                     unsigned long ticks)
1977 {
1978         struct snd_pcm_runtime *runtime = substream->runtime;
1979         if (ticks == 0)
1980                 del_timer(&runtime->tick_timer);
1981         else {
1982                 ticks += (1000000 / HZ) - 1;
1983                 ticks /= (1000000 / HZ);
1984                 mod_timer(&runtime->tick_timer, jiffies + ticks);
1985         }
1986 }
1987
1988 /* Temporary alias */
1989 void snd_pcm_tick_set(struct snd_pcm_substream *substream, unsigned long ticks)
1990 {
1991         snd_pcm_system_tick_set(substream, ticks);
1992 }
1993
1994 void snd_pcm_tick_prepare(struct snd_pcm_substream *substream)
1995 {
1996         struct snd_pcm_runtime *runtime = substream->runtime;
1997         snd_pcm_uframes_t frames = ULONG_MAX;
1998         snd_pcm_uframes_t avail, dist;
1999         unsigned int ticks;
2000         u_int64_t n;
2001         u_int32_t r;
2002         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
2003                 if (runtime->silence_size >= runtime->boundary) {
2004                         frames = 1;
2005                 } else if (runtime->silence_size > 0 &&
2006                            runtime->silence_filled < runtime->buffer_size) {
2007                         snd_pcm_sframes_t noise_dist;
2008                         noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
2009                         snd_assert(noise_dist <= (snd_pcm_sframes_t)runtime->silence_threshold, );
2010                         frames = noise_dist - runtime->silence_threshold;
2011                 }
2012                 avail = snd_pcm_playback_avail(runtime);
2013         } else {
2014                 avail = snd_pcm_capture_avail(runtime);
2015         }
2016         if (avail < runtime->control->avail_min) {
2017                 snd_pcm_sframes_t n = runtime->control->avail_min - avail;
2018                 if (n > 0 && frames > (snd_pcm_uframes_t)n)
2019                         frames = n;
2020         }
2021         if (avail < runtime->buffer_size) {
2022                 snd_pcm_sframes_t n = runtime->buffer_size - avail;
2023                 if (n > 0 && frames > (snd_pcm_uframes_t)n)
2024                         frames = n;
2025         }
2026         if (frames == ULONG_MAX) {
2027                 snd_pcm_tick_set(substream, 0);
2028                 return;
2029         }
2030         dist = runtime->status->hw_ptr - runtime->hw_ptr_base;
2031         /* Distance to next interrupt */
2032         dist = runtime->period_size - dist % runtime->period_size;
2033         if (dist <= frames) {
2034                 snd_pcm_tick_set(substream, 0);
2035                 return;
2036         }
2037         /* the base time is us */
2038         n = frames;
2039         n *= 1000000;
2040         div64_32(&n, runtime->tick_time * runtime->rate, &r);
2041         ticks = n + (r > 0 ? 1 : 0);
2042         if (ticks < runtime->sleep_min)
2043                 ticks = runtime->sleep_min;
2044         snd_pcm_tick_set(substream, (unsigned long) ticks);
2045 }
2046
2047 void snd_pcm_tick_elapsed(struct snd_pcm_substream *substream)
2048 {
2049         struct snd_pcm_runtime *runtime;
2050         unsigned long flags;
2051
2052         snd_assert(substream != NULL, return);
2053         runtime = substream->runtime;
2054         snd_assert(runtime != NULL, return);
2055
2056         snd_pcm_stream_lock_irqsave(substream, flags);
2057         if (!snd_pcm_running(substream) ||
2058             snd_pcm_update_hw_ptr(substream) < 0)
2059                 goto _end;
2060         if (runtime->sleep_min)
2061                 snd_pcm_tick_prepare(substream);
2062  _end:
2063         snd_pcm_stream_unlock_irqrestore(substream, flags);
2064 }
2065
2066 /**
2067  * snd_pcm_period_elapsed - update the pcm status for the next period
2068  * @substream: the pcm substream instance
2069  *
2070  * This function is called from the interrupt handler when the
2071  * PCM has processed the period size.  It will update the current
2072  * pointer, set up the tick, wake up sleepers, etc.
2073  *
2074  * Even if more than one periods have elapsed since the last call, you
2075  * have to call this only once.
2076  */
2077 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
2078 {
2079         struct snd_pcm_runtime *runtime;
2080         unsigned long flags;
2081
2082         snd_assert(substream != NULL, return);
2083         runtime = substream->runtime;
2084         snd_assert(runtime != NULL, return);
2085
2086         if (runtime->transfer_ack_begin)
2087                 runtime->transfer_ack_begin(substream);
2088
2089         snd_pcm_stream_lock_irqsave(substream, flags);
2090         if (!snd_pcm_running(substream) ||
2091             snd_pcm_update_hw_ptr_interrupt(substream) < 0)
2092                 goto _end;
2093
2094         if (substream->timer_running)
2095                 snd_timer_interrupt(substream->timer, 1);
2096         if (runtime->sleep_min)
2097                 snd_pcm_tick_prepare(substream);
2098  _end:
2099         snd_pcm_stream_unlock_irqrestore(substream, flags);
2100         if (runtime->transfer_ack_end)
2101                 runtime->transfer_ack_end(substream);
2102         kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
2103 }
2104
2105 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
2106                                       unsigned int hwoff,
2107                                       unsigned long data, unsigned int off,
2108                                       snd_pcm_uframes_t frames)
2109 {
2110         struct snd_pcm_runtime *runtime = substream->runtime;
2111         int err;
2112         char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2113         if (substream->ops->copy) {
2114                 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2115                         return err;
2116         } else {
2117                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2118                 snd_assert(runtime->dma_area, return -EFAULT);
2119                 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
2120                         return -EFAULT;
2121         }
2122         return 0;
2123 }
2124
2125 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
2126                           unsigned long data, unsigned int off,
2127                           snd_pcm_uframes_t size);
2128
2129 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
2130                                             unsigned long data,
2131                                             snd_pcm_uframes_t size,
2132                                             int nonblock,
2133                                             transfer_f transfer)
2134 {
2135         struct snd_pcm_runtime *runtime = substream->runtime;
2136         snd_pcm_uframes_t xfer = 0;
2137         snd_pcm_uframes_t offset = 0;
2138         int err = 0;
2139
2140         if (size == 0)
2141                 return 0;
2142         if (size > runtime->xfer_align)
2143                 size -= size % runtime->xfer_align;
2144
2145         snd_pcm_stream_lock_irq(substream);
2146         switch (runtime->status->state) {
2147         case SNDRV_PCM_STATE_PREPARED:
2148         case SNDRV_PCM_STATE_RUNNING:
2149         case SNDRV_PCM_STATE_PAUSED:
2150                 break;
2151         case SNDRV_PCM_STATE_XRUN:
2152                 err = -EPIPE;
2153                 goto _end_unlock;
2154         case SNDRV_PCM_STATE_SUSPENDED:
2155                 err = -ESTRPIPE;
2156                 goto _end_unlock;
2157         default:
2158                 err = -EBADFD;
2159                 goto _end_unlock;
2160         }
2161
2162         while (size > 0) {
2163                 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2164                 snd_pcm_uframes_t avail;
2165                 snd_pcm_uframes_t cont;
2166                 if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2167                         snd_pcm_update_hw_ptr(substream);
2168                 avail = snd_pcm_playback_avail(runtime);
2169                 if (((avail < runtime->control->avail_min && size > avail) ||
2170                    (size >= runtime->xfer_align && avail < runtime->xfer_align))) {
2171                         wait_queue_t wait;
2172                         enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED, DROPPED } state;
2173                         long tout;
2174
2175                         if (nonblock) {
2176                                 err = -EAGAIN;
2177                                 goto _end_unlock;
2178                         }
2179
2180                         init_waitqueue_entry(&wait, current);
2181                         add_wait_queue(&runtime->sleep, &wait);
2182                         while (1) {
2183                                 if (signal_pending(current)) {
2184                                         state = SIGNALED;
2185                                         break;
2186                                 }
2187                                 set_current_state(TASK_INTERRUPTIBLE);
2188                                 snd_pcm_stream_unlock_irq(substream);
2189                                 tout = schedule_timeout(10 * HZ);
2190                                 snd_pcm_stream_lock_irq(substream);
2191                                 if (tout == 0) {
2192                                         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED &&
2193                                             runtime->status->state != SNDRV_PCM_STATE_PAUSED) {
2194                                                 state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED;
2195                                                 break;
2196                                         }
2197                                 }
2198                                 switch (runtime->status->state) {
2199                                 case SNDRV_PCM_STATE_XRUN:
2200                                 case SNDRV_PCM_STATE_DRAINING:
2201                                         state = ERROR;
2202                                         goto _end_loop;
2203                                 case SNDRV_PCM_STATE_SUSPENDED:
2204                                         state = SUSPENDED;
2205                                         goto _end_loop;
2206                                 case SNDRV_PCM_STATE_SETUP:
2207                                         state = DROPPED;
2208                                         goto _end_loop;
2209                                 default:
2210                                         break;
2211                                 }
2212                                 avail = snd_pcm_playback_avail(runtime);
2213                                 if (avail >= runtime->control->avail_min) {
2214                                         state = READY;
2215                                         break;
2216                                 }
2217                         }
2218                        _end_loop:
2219                         remove_wait_queue(&runtime->sleep, &wait);
2220
2221                         switch (state) {
2222                         case ERROR:
2223                                 err = -EPIPE;
2224                                 goto _end_unlock;
2225                         case SUSPENDED:
2226                                 err = -ESTRPIPE;
2227                                 goto _end_unlock;
2228                         case SIGNALED:
2229                                 err = -ERESTARTSYS;
2230                                 goto _end_unlock;
2231                         case EXPIRED:
2232                                 snd_printd("playback write error (DMA or IRQ trouble?)\n");
2233                                 err = -EIO;
2234                                 goto _end_unlock;
2235                         case DROPPED:
2236                                 err = -EBADFD;
2237                                 goto _end_unlock;
2238                         default:
2239                                 break;
2240                         }
2241                 }
2242                 if (avail > runtime->xfer_align)
2243                         avail -= avail % runtime->xfer_align;
2244                 frames = size > avail ? avail : size;
2245                 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2246                 if (frames > cont)
2247                         frames = cont;
2248                 snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL);
2249                 appl_ptr = runtime->control->appl_ptr;
2250                 appl_ofs = appl_ptr % runtime->buffer_size;
2251                 snd_pcm_stream_unlock_irq(substream);
2252                 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
2253                         goto _end;
2254                 snd_pcm_stream_lock_irq(substream);
2255                 switch (runtime->status->state) {
2256                 case SNDRV_PCM_STATE_XRUN:
2257                         err = -EPIPE;
2258                         goto _end_unlock;
2259                 case SNDRV_PCM_STATE_SUSPENDED:
2260                         err = -ESTRPIPE;
2261                         goto _end_unlock;
2262                 default:
2263                         break;
2264                 }
2265                 appl_ptr += frames;
2266                 if (appl_ptr >= runtime->boundary)
2267                         appl_ptr -= runtime->boundary;
2268                 runtime->control->appl_ptr = appl_ptr;
2269                 if (substream->ops->ack)
2270                         substream->ops->ack(substream);
2271
2272                 offset += frames;
2273                 size -= frames;
2274                 xfer += frames;
2275                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2276                     snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2277                         err = snd_pcm_start(substream);
2278                         if (err < 0)
2279                                 goto _end_unlock;
2280                 }
2281                 if (runtime->sleep_min &&
2282                     runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2283                         snd_pcm_tick_prepare(substream);
2284         }
2285  _end_unlock:
2286         snd_pcm_stream_unlock_irq(substream);
2287  _end:
2288         return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2289 }
2290
2291 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
2292 {
2293         struct snd_pcm_runtime *runtime;
2294         int nonblock;
2295
2296         snd_assert(substream != NULL, return -ENXIO);
2297         runtime = substream->runtime;
2298         snd_assert(runtime != NULL, return -ENXIO);
2299         snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2300         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2301                 return -EBADFD;
2302
2303         snd_assert(substream->ffile != NULL, return -ENXIO);
2304         nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2305 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2306         if (substream->oss.oss) {
2307                 struct snd_pcm_oss_setup *setup = substream->oss.setup;
2308                 if (setup != NULL) {
2309                         if (setup->nonblock)
2310                                 nonblock = 1;
2311                         else if (setup->block)
2312                                 nonblock = 0;
2313                 }
2314         }
2315 #endif
2316
2317         if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2318             runtime->channels > 1)
2319                 return -EINVAL;
2320         return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
2321                                   snd_pcm_lib_write_transfer);
2322 }
2323
2324 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
2325                                        unsigned int hwoff,
2326                                        unsigned long data, unsigned int off,
2327                                        snd_pcm_uframes_t frames)
2328 {
2329         struct snd_pcm_runtime *runtime = substream->runtime;
2330         int err;
2331         void __user **bufs = (void __user **)data;
2332         int channels = runtime->channels;
2333         int c;
2334         if (substream->ops->copy) {
2335                 snd_assert(substream->ops->silence != NULL, return -EINVAL);
2336                 for (c = 0; c < channels; ++c, ++bufs) {
2337                         if (*bufs == NULL) {
2338                                 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
2339                                         return err;
2340                         } else {
2341                                 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2342                                 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2343                                         return err;
2344                         }
2345                 }
2346         } else {
2347                 /* default transfer behaviour */
2348                 size_t dma_csize = runtime->dma_bytes / channels;
2349                 snd_assert(runtime->dma_area, return -EFAULT);
2350                 for (c = 0; c < channels; ++c, ++bufs) {
2351                         char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2352                         if (*bufs == NULL) {
2353                                 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
2354                         } else {
2355                                 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2356                                 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
2357                                         return -EFAULT;
2358                         }
2359                 }
2360         }
2361         return 0;
2362 }
2363
2364 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
2365                                      void __user **bufs,
2366                                      snd_pcm_uframes_t frames)
2367 {
2368         struct snd_pcm_runtime *runtime;
2369         int nonblock;
2370
2371         snd_assert(substream != NULL, return -ENXIO);
2372         runtime = substream->runtime;
2373         snd_assert(runtime != NULL, return -ENXIO);
2374         snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2375         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2376                 return -EBADFD;
2377
2378         snd_assert(substream->ffile != NULL, return -ENXIO);
2379         nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2380 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2381         if (substream->oss.oss) {
2382                 struct snd_pcm_oss_setup *setup = substream->oss.setup;
2383                 if (setup != NULL) {
2384                         if (setup->nonblock)
2385                                 nonblock = 1;
2386                         else if (setup->block)
2387                                 nonblock = 0;
2388                 }
2389         }
2390 #endif
2391
2392         if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2393                 return -EINVAL;
2394         return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2395                                   nonblock, snd_pcm_lib_writev_transfer);
2396 }
2397
2398 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
2399                                      unsigned int hwoff,
2400                                      unsigned long data, unsigned int off,
2401                                      snd_pcm_uframes_t frames)
2402 {
2403         struct snd_pcm_runtime *runtime = substream->runtime;
2404         int err;
2405         char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2406         if (substream->ops->copy) {
2407                 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2408                         return err;
2409         } else {
2410                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2411                 snd_assert(runtime->dma_area, return -EFAULT);
2412                 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2413                         return -EFAULT;
2414         }
2415         return 0;
2416 }
2417
2418 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
2419                                            unsigned long data,
2420                                            snd_pcm_uframes_t size,
2421                                            int nonblock,
2422                                            transfer_f transfer)
2423 {
2424         struct snd_pcm_runtime *runtime = substream->runtime;
2425         snd_pcm_uframes_t xfer = 0;
2426         snd_pcm_uframes_t offset = 0;
2427         int err = 0;
2428
2429         if (size == 0)
2430                 return 0;
2431         if (size > runtime->xfer_align)
2432                 size -= size % runtime->xfer_align;
2433
2434         snd_pcm_stream_lock_irq(substream);
2435         switch (runtime->status->state) {
2436         case SNDRV_PCM_STATE_PREPARED:
2437                 if (size >= runtime->start_threshold) {
2438                         err = snd_pcm_start(substream);
2439                         if (err < 0)
2440                                 goto _end_unlock;
2441                 }
2442                 break;
2443         case SNDRV_PCM_STATE_DRAINING:
2444         case SNDRV_PCM_STATE_RUNNING:
2445         case SNDRV_PCM_STATE_PAUSED:
2446                 break;
2447         case SNDRV_PCM_STATE_XRUN:
2448                 err = -EPIPE;
2449                 goto _end_unlock;
2450         case SNDRV_PCM_STATE_SUSPENDED:
2451                 err = -ESTRPIPE;
2452                 goto _end_unlock;
2453         default:
2454                 err = -EBADFD;
2455                 goto _end_unlock;
2456         }
2457
2458         while (size > 0) {
2459                 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2460                 snd_pcm_uframes_t avail;
2461                 snd_pcm_uframes_t cont;
2462                 if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2463                         snd_pcm_update_hw_ptr(substream);
2464               __draining:
2465                 avail = snd_pcm_capture_avail(runtime);
2466                 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
2467                         if (avail < runtime->xfer_align) {
2468                                 err = -EPIPE;
2469                                 goto _end_unlock;
2470                         }
2471                 } else if ((avail < runtime->control->avail_min && size > avail) ||
2472                            (size >= runtime->xfer_align && avail < runtime->xfer_align)) {
2473                         wait_queue_t wait;
2474                         enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED, DROPPED } state;
2475                         long tout;
2476
2477                         if (nonblock) {
2478                                 err = -EAGAIN;
2479                                 goto _end_unlock;
2480                         }
2481
2482                         init_waitqueue_entry(&wait, current);
2483                         add_wait_queue(&runtime->sleep, &wait);
2484                         while (1) {
2485                                 if (signal_pending(current)) {
2486                                         state = SIGNALED;
2487                                         break;
2488                                 }
2489                                 set_current_state(TASK_INTERRUPTIBLE);
2490                                 snd_pcm_stream_unlock_irq(substream);
2491                                 tout = schedule_timeout(10 * HZ);
2492                                 snd_pcm_stream_lock_irq(substream);
2493                                 if (tout == 0) {
2494                                         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED &&
2495                                             runtime->status->state != SNDRV_PCM_STATE_PAUSED) {
2496                                                 state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED;
2497                                                 break;
2498                                         }
2499                                 }
2500                                 switch (runtime->status->state) {
2501                                 case SNDRV_PCM_STATE_XRUN:
2502                                         state = ERROR;
2503                                         goto _end_loop;
2504                                 case SNDRV_PCM_STATE_SUSPENDED:
2505                                         state = SUSPENDED;
2506                                         goto _end_loop;
2507                                 case SNDRV_PCM_STATE_DRAINING:
2508                                         goto __draining;
2509                                 case SNDRV_PCM_STATE_SETUP:
2510                                         state = DROPPED;
2511                                         goto _end_loop;
2512                                 default:
2513                                         break;
2514                                 }
2515                                 avail = snd_pcm_capture_avail(runtime);
2516                                 if (avail >= runtime->control->avail_min) {
2517                                         state = READY;
2518                                         break;
2519                                 }
2520                         }
2521                        _end_loop:
2522                         remove_wait_queue(&runtime->sleep, &wait);
2523
2524                         switch (state) {
2525                         case ERROR:
2526                                 err = -EPIPE;
2527                                 goto _end_unlock;
2528                         case SUSPENDED:
2529                                 err = -ESTRPIPE;
2530                                 goto _end_unlock;
2531                         case SIGNALED:
2532                                 err = -ERESTARTSYS;
2533                                 goto _end_unlock;
2534                         case EXPIRED:
2535                                 snd_printd("capture read error (DMA or IRQ trouble?)\n");
2536                                 err = -EIO;
2537                                 goto _end_unlock;
2538                         case DROPPED:
2539                                 err = -EBADFD;
2540                                 goto _end_unlock;
2541                         default:
2542                                 break;
2543                         }
2544                 }
2545                 if (avail > runtime->xfer_align)
2546                         avail -= avail % runtime->xfer_align;
2547                 frames = size > avail ? avail : size;
2548                 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2549                 if (frames > cont)
2550                         frames = cont;
2551                 snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL);
2552                 appl_ptr = runtime->control->appl_ptr;
2553                 appl_ofs = appl_ptr % runtime->buffer_size;
2554                 snd_pcm_stream_unlock_irq(substream);
2555                 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
2556                         goto _end;
2557                 snd_pcm_stream_lock_irq(substream);
2558                 switch (runtime->status->state) {
2559                 case SNDRV_PCM_STATE_XRUN:
2560                         err = -EPIPE;
2561                         goto _end_unlock;
2562                 case SNDRV_PCM_STATE_SUSPENDED:
2563                         err = -ESTRPIPE;
2564                         goto _end_unlock;
2565                 default:
2566                         break;
2567                 }
2568                 appl_ptr += frames;
2569                 if (appl_ptr >= runtime->boundary)
2570                         appl_ptr -= runtime->boundary;
2571                 runtime->control->appl_ptr = appl_ptr;
2572                 if (substream->ops->ack)
2573                         substream->ops->ack(substream);
2574
2575                 offset += frames;
2576                 size -= frames;
2577                 xfer += frames;
2578                 if (runtime->sleep_min &&
2579                     runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2580                         snd_pcm_tick_prepare(substream);
2581         }
2582  _end_unlock:
2583         snd_pcm_stream_unlock_irq(substream);
2584  _end:
2585         return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2586 }
2587
2588 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2589 {
2590         struct snd_pcm_runtime *runtime;
2591         int nonblock;
2592
2593         snd_assert(substream != NULL, return -ENXIO);
2594         runtime = substream->runtime;
2595         snd_assert(runtime != NULL, return -ENXIO);
2596         snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2597         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2598                 return -EBADFD;
2599
2600         snd_assert(substream->ffile != NULL, return -ENXIO);
2601         nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2602 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2603         if (substream->oss.oss) {
2604                 struct snd_pcm_oss_setup *setup = substream->oss.setup;
2605                 if (setup != NULL) {
2606                         if (setup->nonblock)
2607                                 nonblock = 1;
2608                         else if (setup->block)
2609                                 nonblock = 0;
2610                 }
2611         }
2612 #endif
2613         if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2614                 return -EINVAL;
2615         return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2616 }
2617
2618 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2619                                       unsigned int hwoff,
2620                                       unsigned long data, unsigned int off,
2621                                       snd_pcm_uframes_t frames)
2622 {
2623         struct snd_pcm_runtime *runtime = substream->runtime;
2624         int err;
2625         void __user **bufs = (void __user **)data;
2626         int channels = runtime->channels;
2627         int c;
2628         if (substream->ops->copy) {
2629                 for (c = 0; c < channels; ++c, ++bufs) {
2630                         char __user *buf;
2631                         if (*bufs == NULL)
2632                                 continue;
2633                         buf = *bufs + samples_to_bytes(runtime, off);
2634                         if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2635                                 return err;
2636                 }
2637         } else {
2638                 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2639                 snd_assert(runtime->dma_area, return -EFAULT);
2640                 for (c = 0; c < channels; ++c, ++bufs) {
2641                         char *hwbuf;
2642                         char __user *buf;
2643                         if (*bufs == NULL)
2644                                 continue;
2645
2646                         hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2647                         buf = *bufs + samples_to_bytes(runtime, off);
2648                         if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2649                                 return -EFAULT;
2650                 }
2651         }
2652         return 0;
2653 }
2654
2655 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2656                                     void __user **bufs,
2657                                     snd_pcm_uframes_t frames)
2658 {
2659         struct snd_pcm_runtime *runtime;
2660         int nonblock;
2661
2662         snd_assert(substream != NULL, return -ENXIO);
2663         runtime = substream->runtime;
2664         snd_assert(runtime != NULL, return -ENXIO);
2665         snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2666         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2667                 return -EBADFD;
2668
2669         snd_assert(substream->ffile != NULL, return -ENXIO);
2670         nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2671 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2672         if (substream->oss.oss) {
2673                 struct snd_pcm_oss_setup *setup = substream->oss.setup;
2674                 if (setup != NULL) {
2675                         if (setup->nonblock)
2676                                 nonblock = 1;
2677                         else if (setup->block)
2678                                 nonblock = 0;
2679                 }
2680         }
2681 #endif
2682
2683         if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2684                 return -EINVAL;
2685         return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2686 }
2687
2688 /*
2689  *  Exported symbols
2690  */
2691
2692 EXPORT_SYMBOL(snd_interval_refine);
2693 EXPORT_SYMBOL(snd_interval_list);
2694 EXPORT_SYMBOL(snd_interval_ratnum);
2695 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
2696 EXPORT_SYMBOL(_snd_pcm_hw_param_min);
2697 EXPORT_SYMBOL(_snd_pcm_hw_param_set);
2698 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
2699 EXPORT_SYMBOL(_snd_pcm_hw_param_setinteger);
2700 EXPORT_SYMBOL(snd_pcm_hw_param_value_min);
2701 EXPORT_SYMBOL(snd_pcm_hw_param_value_max);
2702 EXPORT_SYMBOL(snd_pcm_hw_param_mask);
2703 EXPORT_SYMBOL(snd_pcm_hw_param_first);
2704 EXPORT_SYMBOL(snd_pcm_hw_param_last);
2705 EXPORT_SYMBOL(snd_pcm_hw_param_near);
2706 EXPORT_SYMBOL(snd_pcm_hw_param_set);
2707 EXPORT_SYMBOL(snd_pcm_hw_refine);
2708 EXPORT_SYMBOL(snd_pcm_hw_constraints_init);
2709 EXPORT_SYMBOL(snd_pcm_hw_constraints_complete);
2710 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
2711 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
2712 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
2713 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
2714 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
2715 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
2716 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
2717 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
2718 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
2719 EXPORT_SYMBOL(snd_pcm_set_ops);
2720 EXPORT_SYMBOL(snd_pcm_set_sync);
2721 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
2722 EXPORT_SYMBOL(snd_pcm_stop);
2723 EXPORT_SYMBOL(snd_pcm_period_elapsed);
2724 EXPORT_SYMBOL(snd_pcm_lib_write);
2725 EXPORT_SYMBOL(snd_pcm_lib_read);
2726 EXPORT_SYMBOL(snd_pcm_lib_writev);
2727 EXPORT_SYMBOL(snd_pcm_lib_readv);
2728 EXPORT_SYMBOL(snd_pcm_lib_buffer_bytes);
2729 EXPORT_SYMBOL(snd_pcm_lib_period_bytes);
2730 /* pcm_memory.c */
2731 EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all);
2732 EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages);
2733 EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all);
2734 EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page);
2735 EXPORT_SYMBOL(snd_pcm_lib_malloc_pages);
2736 EXPORT_SYMBOL(snd_pcm_lib_free_pages);